Filling withdrawing carrier for weaving machine

ABSTRACT

The invention relates to a filling withdrawing carrier for a weaving machine in which filling is inserted upon being drawn from a supply package situated outside of the warp shed, said carrier being provided with a thread guiding cam to guide the filling thread on its takeover from the inserting carrier in combination with a flat spring adjacent to the thread guiding cam between which the filling may pass to be trapped and in which carrier tension is imposed on the filling by means other than the flat spring.

United States Patent Bruhwiler [45] Aug. 15, 1972 [54] FILLING WITHDRAWING'CARRIER [56] 7 References Cited FOR WEAVING MACHINE UNITED STATES PATENTS 1 lnvemov 9 a Bruhwiler, g i Switzer- 3,034,540 5/1962 Lipsky ..139/122 N an [73] Assigneez Georg Fischer AGBrugg Brugg FOREIGN PATENTS OR APPLICATIONS Switzerland 1,444,834 5/1966 France ..I39/ 122 N [22] Filed: 1970 Primary Examiner-Henry S. Jaudon [2|] App]. No.: 101,832 AttorneyDona.ld D. Denton 301 Foreign Application Priority Data 4 [57] ABSTRACT Jan 16 1970 Switzerland 619/70 The invention relates to a filling withdrawing carrier for a weaving machine in which filling is inserted upon being drawn from a supply'package situated outside of ass/12 2 the wan, Shed Said carrier being provided with a [58] Field oi s ii c liIIIIIIII iYi22ii 123 127 R thread guiding guide the fining thread its takeover from the inserting carrier in combination with a flat spring adjacent to the thread guiding cam between which the filling may pass to be trapped and in which carrier tension is imposed on the filling by means other than the flat spring.

1 Claim, 2 Drawing Figures Patented Aug. 15, 1972 3,683,971

INVENTOR. Othmur BrUhwiler FILLING WITI-IDRAWING CARRIER FOR WEAVING MACHINE BACKGROUND OF THE INVENTION For shuttleless weaving machines a filling insertion system such as, for instance, that of German Pat. No. 826,274 is known by which the filling is inserted in the form of a loop by an inserting carrier to about the middle of the warp shed where it is taken over by a withdrawing carrier which pulls the thread loop out over the other half of the warp shed. This system is known as the loop insertion system. The known withdrawing carriers of the aforementioned kind, e.g. according to US. Pat. No. 3,034,540 are provided with a flat or leaf type spring, one end of which is fastened to the carrier body whereas the other end of the spring rests against the thread guide cam at the intake end .of the carrier.

' On each transfer or threading-up of a pick into such a withdrawing carrier, the fiat spring has to be slightly displaced by the filling thread. This strain on the yarn can lead to filling breakage when using fine and weak yarns or to filament separation and breakage when using filament yarns thus causing visible faults in the fabric, or more. If the flat spring is not properly seated on the carrier body, itcan furthermore happen that the filling unthreads from the carrier which causes a loom stop.

SUMMARY OF THE INVENTION 1 The purpose of the present invention is to overcome these disadvantages. The withdrawing carrier according to the invention is characterized in that thethread guiding cam is provided with a convex guiding face and in that the flat spring has a correspondingly concave portion which is at least nearly parallel with the guiding face, thereby forming a concave or arched passage for thefilling thread, and also, whereby the concave portion overlaps the rear end of the thread guiding cam in the extension of the passage.

The free passage between thread guiding cam and fiat spring allows the thread to enter without obstruc tion and lets small inaccuracies in setting have no influence on the function of the carrier. Once threaded up, the filling yarn can not unthread from the carrier.

The drawings show by way of example one configuration of the invention whereby:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of the filling yarn withdrawing carrier according to the invention, and

FIG. 2 is a section taken along line lI-II in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is'a plan view of a filling yarn withdrawing carrier and shows a tape 1 to which a carrier body 2 is fixedly connected. The carrier body has a nose 3 pointing toward an inserting carrier (not shown) from which an oblique face 4 leads to a thread guiding cam S. In effect, the tensioned filling is engaged by face 4 and is displaced laterally to pass along the cam 5.

A screw 6 with s shank positions front tensioning plate 8 and a rear tensioning plate 9 in the carrier body 2. For further guiding purposes the tensioning plates 8 and 9 are each provided with a lug 10 projecting into a bore 11 of the carrier body 2 and the thread guiding cam 5, respectively. These plate connections are all free so that the tension plates may move apart or together to accommodate the filling.

In another bore 12, a compression spring 13 is guided in the carrier body 2, pressing the tensioning plates 8, 9 against each other and, of course, applying a weaving tension to the filling passing between them.

The back end of the flat spring 14 is'fastened to the carrier body 2 by means of a ledge 15 and screws 16. At the front end the flat spring 14 extends into a point 17 forming there the thread catching section 18 together with the oblique face 4.

FIG. 2 shows a section across the filling yarn withdrawing carrier wherein the section runs across the axis of screw shank 7. It is to be understood that thisv shank ishardened and polished since the filling runs past it. It can be seen that the thread guiding cam 5 is provided with a convex guiding face 19 adjacent to the oblique face 4, opposite to which is arranged a correspondingly concave portion 20 of the flat spring 14. Between the convex guiding face 19 and the concave portion 20 there is an arched or bowed passage 21, wherein the crest line of the convex guiding face projects between the two side edges of the portion 20 so that there is an appreciable overlap of these side edges beyond the crest line, FIG. 1.

According to FIG. 1, the rear end 22 of the thread guiding can 5 is situated within the concave portion 20 of the fiat spring 14, i.e. the end 22 is overlapped lengthwise by the portion 20 in extension of the passage 21, whereby a safe threadingp of the filling into the tensioning device 24 is provided.

The described configuration of the withdrawing carrier allows takingover of the filling from the inserting carrier without particular strain, in that the thread slides from the catching section 18 back through. the arched passage 21 without having to displace the spring 14. Yet it is assured that the filling yarn cannot unthread from the carrier and that it slides safely between the two tensioning plates 8, 9. There is no danger of breaking the filling at transfer nor of fraying filaments in the event that type of material is used.

This disclosure of a preferred embodiment of the invention is to be interpreted as illustrative of one form the invention may take and modifications will readily occur to those skilled in the art. The invention is not to be restricted except by the scope of the appended claims wherein the novel features desiredto be protected by Letters Patent are set forth.

Iclaim:

1. A filling yarn withdrawing carrier for a weaving. machine in which filling is inserted from a supply package positioned outside of the warp shed, said carrier being provided with a thread guiding cam to guide the filling thread on its takeover from an inserting carrier and with a flat spring adjacent to the thread guiding cam, characterized in that the thread guiding cam (5 is provided with a curved guiding face (19) and in that the flat spring (14) has a correspondingly curved portion (20) which is at least nearly parallel with the guiding face and spaced therefrom, thereby forming an open arched passage (21) for the filling thread, in which the curved portion of the spring overlaps the rear end (22) of the thread guiding cam in a lengthwise direction from the passage.

IR i 

1. A filling yarn withdrawing carrier for a weaving machine in which filling is inserted from a supply package positioned outside of the warp shed, said carrier being provided with a thread guiding cam to guide the filling thread on its takeover from an inserting carrier and with a flat spring adjacent to the thread guiding cam, characterized in that the thread guiding cam (5) is provided with a curved guiding face (19) and in that the flat spring (14) has a correspondingly curved portion (20) which is at least nearly parallel with the guiding face and spaced therefrom, thereby forming an open arched passage (21) for the filling thread, in which the curved portion of the spring overlaps the rear end (22) of the thread guiding cam in a lengthwise direction from the passage. 